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Bubnov MP, Zolotukhin AA, Fukin GK, Rumyantcev RV, Bogomyakov AS. Valence tautomeric interconversion of bis-dioxolene cobalt complex with imino-pyridine functionalized by TEMPO moiety in solid solutions with isostructural nickel analogue: phase transitions and monocrystal destruction. Dalton Trans 2024; 53:9151-9160. [PMID: 38742270 DOI: 10.1039/d4dt00453a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Valence tautomeric complexes (VT) are promising systems for creating molecular devices. From this viewpoint, valence tautomeric complexes with a hysteresis loop on the magnetic curve are of special interest as potential memory elements. The hysteresis loop is a consequence of retarded structural rearrangements which investigation is an actual problem. Recently, we have described a new VT transition taking place in a bis-dioxolene cobalt complex with imino-pyridine having a TEMPO substituent (A. A. Zolotukhin, et al., Inorg. Chem., 2017, 56, 14751-14754). Valence tautomeric transformation occurs with a hysteresis loop and is accompanied by a phase transition. The phase transition taking place during cooling is accompanied by crystal destruction. This fact makes it impossible to monitor the structural changes responsible for the hysteresis loop. The current research attempts to resolve this problem. A nickel compound of the same composition (TEMPO-imino-pyridine)Ni(3,6-DBSQ)2 was synthesized and characterized. It was established to be isostructural with the cobalt complex. It was used as an inert matrix for the dilution of the VT cobalt complex. The number of solid solutions with Co/Ni ratios of 1 : 1, 1 : 2, 1 : 4, and 1 : 8 was obtained. Variable temperature magnetic susceptibility measurements show that VT transformation with a hysteresis loop takes place in all solid solutions. The hysteresis loop is shifted to low temperatures primarily due to the shifting of its low-temperature boundary with dilution. The hysteresis width does not change significantly with dilution. DSC detected that transformations are accompanied by phase transitions at different temperatures at cooling and heating. The phase transition at the first cooling occurs at slightly lower temperatures compared with subsequent cycles. These temperatures correspond to the transition temperatures detected from the magnetic curves. The phase transition during the first cooling is accompanied by crystal destruction. Physical destruction takes place in the crystals of all solid solutions. X-ray diffraction powder patterns confirm that phase transition is accompanied by considerable reorganization of the crystal structure typical for the first order transitions. The unit cell volume of solid solutions is larger than that of pure complexes. Especially calculated crystal invariom indicated that the "lattice energy" in a solid solution is the lowest compared with that in "pure" nickel and cobalt complexes.
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Affiliation(s)
- Michael P Bubnov
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Alexey A Zolotukhin
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Georgy K Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Roman V Rumyantcev
- G. A. Razuvaev Institute of Organometallic Chemistry of RAS, 49 Tropinina Str., GSP-445, 603950 Nizhny Novgorod, Russia.
| | - Artem S Bogomyakov
- International Tomography Center of the SB of RAS, Institutskaya Str., 3a, Novosibirsk 630090, Russia.
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Ilichev VA, Rogozhin AF, Rumyantcev RV, Kozlova EA, Fukin GK, Yablonskiy AN, Andreev BA, Bochkarev MN. Lanthanide Coordination Polymers with Soft-Base Ditopic Bisthiazolate Ligands. Inorg Chem 2023; 62:12625-12629. [PMID: 37523240 DOI: 10.1021/acs.inorgchem.3c01349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
In order to prepare the first lanthanide coordination polymers (CPs) based on ditopic sulfide ligands, benzo[1,2-d:4,5-d']bisthiazole-2,6(3H,7H)-dithione (H2L) was used as a linker. The reactions of lanthanide silylamides Ln[N(SiMe3)2]3 (Ln = Nd, Gd, Er, and Yb) with H2L result in the formation of soluble dimethyl sulfoxide (DMSO) ionic salts [Ln(DMSO)8][L]1.5 [Ln = Nd (1), Gd (2), Er (3), and Yb (4)]. Due to the lack of coordination of anionic ligands, compounds 1, 3, and 4 do not show sensitized metal-centered photoluminescence (PL), while Gd compound 2 shows weak phosphorescence at 77 K. It was found that the heating of 1 in a 1:9 DMSO/1,4-dioxane mixture leads to the formation of large crystals of 2D CP [Nd(DMSO)3L1.5·0.5diox]n (5), where deprotonated dithione H2L plays the role of a ditopic linker. This linker acts as an "antenna" in compound 5, providing an intense near-infrared (NIR) PL of Nd3+ ion upon near-UV and blue-light excitation. The application of a synthetic protocol similar to that of compounds 2-4 led to the formation of amorphous compounds [Ln(DMSO)3L1.5·0.5diox]n [Ln = Gd (6), Er (7), and Yb (8)], whose PL properties significantly differ from those of the parental ionic salts. In the case of Yb polymer 8, the PL excitation spectra are shifted to the red region due to a low-energy ligand-to-metal charge-transfer state. The synthesized compounds 5-8 are the first examples of lanthanide CPs using soft-base ditopic linkers in their structures.
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Affiliation(s)
- Vasily A Ilichev
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Anton F Rogozhin
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Roman V Rumyantcev
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Ekaterina A Kozlova
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Georgy K Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
| | - Artem N Yablonskiy
- Institute for Physics of Microstructures, Russian Academy of Sciences, Akademicheskaya 7, 603950 Nizhny Novgorod, Russian Federation
| | - Boris A Andreev
- Institute for Physics of Microstructures, Russian Academy of Sciences, Akademicheskaya 7, 603950 Nizhny Novgorod, Russian Federation
| | - Mikhail N Bochkarev
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation
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Rumyantcev RV, Yu. Zhigulin G, Zabrodina GS, Katkova MA, Yu. Ketkov S, Fukin GK. Electron density topology in CaII–CuII alanine hydroximate metallacrowns: crystal invariom vs DFT calculation. MENDELEEV COMMUNICATIONS 2023. [DOI: 10.1016/j.mencom.2023.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Fukin GK, Cherkasov AV, Rumyantcev RV. Decision problem with high residual electron density on the metal atom. MENDELEEV COMMUNICATIONS 2022. [DOI: 10.1016/j.mencom.2022.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Influence of pseudo-polymorphism on the structure and thermal behavior of the new barium β-diketonate complexes [Ba(adtfa)2(18-crown-6)] and [Ba(adtfa)2(18-crown-6)](CDCl3)2. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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